Control for a plurality of fluid pressure motors



Sept 25, 1950 G. E. JANssoN 2,523,572

CONTROL FOR A PLURALITY 0F' FLUID PRESSURE MOTORS Original Filed March1B, 1944 ,\\\\\\\\\\\\\\\\\\\\\\\\\\\\\Y i\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\Y=\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\vr r11/lll 111/1/11111/- /mo/ma/y) Patented Sept. 26, 1950 4CONTROL FOR APLURALITY OF FLUID PRESSURE MOTORS Gustav E. Jansson, North Quincy,Mass., assignor to Allis-Chalmers Manufacturing Company,

Milwaukee, Wis., a corporation of Delaware `Continuation of applicationSerial No. 527,047, March 18, 1944. This application July 9, 1948,

Serial No. 37,798

This invention relates generally to control means for fluid pressureoperated motors and particularly to interlocking means for controllingthe operation of one motor while another motor is operating.

It is an object of the present invention to provide a new and improvedmotive system including a plurality of iiuid pressure operated motors inwhich movement of one motor is arrested in response to movement ofanother motor.

Another object of the invention is to provide a new and improved motivesystem including a plurality of fluid pressure operated motors in whichone motor is gradually decelerated in response to movement of anothermotor.

Another object of the invention is to provide a new and improved motivesystem` including a plurality of iluid pressure operated motors in whichone motor is prevented from operating while another motor is operating.

Another object of the invention is to provide a new and improved motivesystem including a plurality of fluid pressure operated motors in whichthe deceleration of one motor is dependent upon the deceleration ofanother motor.

Objects and advantages other than those above set forth will be apparentfrom the following description when read in connection with theaccompanying drawing, in which the single figure is a diagrammaticshowing of a circuit breaker and control therefor embodying the presentinvention.

As shown in the drawing, the circuit breaker consists essentially of aiixed arcing contact 6 and a movable contact 1 connected in series withdisconnect contacts 8 and S in a circuit indicated by conductors II andIII. The movable arcing contact 1 is actuated to open position by thebreaking of a toggle formed by links 9|, one end of which is anchored tothe circuit breaker frame by a spider member 99. The toggle SI is brokenby movement of piston 92 to the right as viewed in the drawing. Thepiston 92 is biased by spring 93 to hold the aroing contacts 9, 1 in theclosed position shown. The toggle 9| is electrically paralleled by shunt13.

When the arcing contacts 1 are separated, the arc drawn therebetween isblasted through the orifice 28 against auxiliary contact S5, therebyconnecting the resistance SE in circuit with the arc. The effect of theresistance 96 and the deionization and lcooling provided by the blast ofair through the orice 28, quickly extinguishes the arc and interruptsthe circuit through conductors II and III. After the are is extinguished7 Claims. (Cl. 121-38) at the arcing contacts 6, 1, the disconnectcontacts 8, 9 are opened thereby isolating conductors II and II I.Opening of the disconnect contact 9 effects closure of the blast valveI4, thereby permitting the spring S3 to reclose the arcing contacts6, 1. The circuit is closed by closing the disconnect contacts 8, 9.

Separate fluid operated motors I2 and i3 are provided for closing andopening actuation, respectively, and these motors are interlocked witheach other and with the blast valve operation to provide for rapidoperation, especially when the breaker is closed and immediatelyreopened or opened and immediately reclosed. In high voltage circuitbreakers of the type used for outdoor installations, the disconnectcontact 9 and its operating members are necessarily large and heavy andtherefore have great inertia. These members are not only rapidlyoperated, but also provision is made for absorbing their kinetic energyand for preparing for an immediate reverse operation.

The circuit breaker is shown with all parts thereof and of the pneumaticcontrol system in l the open circuit position. A closing operation isinitiated by energization of the closing solenoid valve 34, therebypermitting air under pressure from tank I1 and feed pipe 21 to be fed topipe 11. Air under pressure in pipe 11 acts through pipe 1I on the slidevalve 68 of the opening motors I3. A slot 12 in the operating linkv ofslide valve 68 permits the slide valve 58 to be moved to the left,thereby opening port S9 in cylinder 62 to atmosphere through port 1E.This permits bleeding to atmosphere of any air under pressure incylinder 62 of opening motor il* tending to provide an opening impulse.

Pressure air in pipe 11 also opens chock valve 18 against the bias ofits .spring Si? and feeds air under pressure to the cylinder 16 throughthe passage 19. Opening of check valve 13 closes the port 8l)y and thepassage through the needle valve 8I, so that the air pressurein cylinder16 available for movement of piston 15. This air pressure moves piston15 to the left, rotating shaft Il) to close the movable disconnectcontact 9. The impact of stopping the closing movement of contact 9 iscushioned by action of opening piston 6I in opening cylinder 62. Asclosing movement of the contact 9` takes place, a pin on the operatinglink 63 moves in the slot 12 of the slide valve 68 and further movementof shaft I0 and link 63 moves the slide valve 68 to vthe right as'viewedin the drawing, thereby closing port 10. Further movement of the piston6! is utilized to cushion the impact of stopping the closing mechanismby compressing the remaining air in cylinder 52 to a degree adjusted bythe amount of air bled through the passage 65 past the needle valve G1.

Closing movement of the shaft I also moves link 33 to reset theoperating mechanism of the blast valve I4 for an opening operation.Closing movement of the shaft I0 moves slide valve 22 to the right asviewed in the drawing, closing the ports 24 and 30. This closes thespace above pistons I8 and 2G of the main and pilot valves I4 and I5 inreadiness for an opening operation. Movement of link 33 also moves slidevalve 25 to the left as viewed in the drawing closing the air passage 32and opening the space underneath piston I8 to atmosphere through passage25 and port 3|. The valve operating mechanism is now ready for anopening operation. Slide valve 82 is moved by a pin on the operatinglink 63 acting in the slot 14 to open ports 83 and 84. This bleeds outair behind the closing piston 15 and prepares closing motor I2 forproper functioning during an opening operation. The breaker is nowclosed.

To open the breaker, solenoid Valve 35 is energized placing pressure airfrom pipe 21 on top of piston 2D of the pilot valve I5. Opening of thepilot valve I5 places pressure air from pipe 21 on top of piston |8 ofthe main blast valve I4. The pipe 21, the opening controlled by valve I5and the passageway from this valve to the piston I8 all have relativelylarge cross sectional areas so that opening of the blast valve takesplace immediately upon opening of the pilot valve I5. Opening of theblast valve |4 places pressure air in the manifold I6 and also in thechamber containing the arcing contacts B, 1.

While the pressure is being built up in the contact chamber,substantially full contact pressure is maintained on the arcing contactsuntil separation actually begins, due to the action of spring 93 andtoggle links 9|. Pressure from the contact chamber acts through valve 94upon piston 92 to break the toggle 9|, thereby separating the arcingcontacts. The needle valve 94 is adjusted to assure opening of thearcing contacts only after there is a predetermined air pressure in thecontact chamber. The arc formed at the separating arcing contacts 6, 1is then extinguished by the blast of `air in the manner previouslydescribed.

The disconnect contact 9 is opened a predetermined time after opening ofthe arcing contacts. Air from the blast tube I6 flows through the feedpipes 54 and 88 and acts on piston 81, raising the same until theprojection 89 is stopped against the check valve 'I8 holding the sameclosed. In this position of piston 81, the pipe 86 is opened toatmosphere. The diameter of piston 81 is greater than that of valve 18.Thus, the action of piston 81 not only prevents closing air from openingthe check valve 18 and being'applied to the piston 15, but also bleeds01T any closing air pressure retained in the pipe 11 which might beavailable to initiate a closing operation even though the valve 34 isnot opened. This interlock is especially advantageous on a close-openoperation, where opening takes place immediately after closure.

Air under pressure in feed pipe 64vis also fed through pipe 85 to theslide valve 82. This action maintains the ports 83 and 84 open until thepin on member 63 has moved to the end of the slot 14. The closing motoris thereby prevented from arresting the action of the opening motorduring the rst part of its opening stroke. Pressure air from the blasttube I6 is also fed through pipe 64 to check valve 65 of opening motorI3. Movement of check valve 65 closes the port 66 and permits pressureair to build up in cylinder 62, thereby moving piston 6| to the left andopening disconnect contact 9.

In order to conserve blast air and to rapidly prepare the operatingsystem for immediate reclosing of the disconnect contacts, openingmovement of the shaft I0 acting through link 33 moves the slide valve 22to the left as viewed in the drawing, first opening port 3D to permitpressure air from above piston 2|! to discharge to atmosphere throughthe port 23. This permits pilot valve I5 to be immediately closed byaction of its biasing spring 2|. Further movement of slide valve 22 tothe left opens port 24 permitting air above the piston I8 of the mainblast valve to be exhausted to atmosphere through port 23. To aid inrapidly reclosing the blast valve I4, opening movement of the shaft IUand link 33 moves slide valve 26 to the right closing the port 3| andopening the port 32 so that pressure air is applied through passageway25 to the underside of the piston I8. This aids the spring I9 to rapidlyclose the blast valve I4, thereby conserving the air pressure in tank |1and resetting the blast valve operating mechanism for an openingoperation.

During the opening movement of the shaft I0, slide valve 82 is moved tothe right when the pin on link 63 moves to the end of slot 14 and slidevalve 82 therefore provides for the cushioning action of piston 15 inthe same manner as described with regard to the action of piston 6| andthe slide valve 68 during the closing operation. The cushioning actionof piston 15 is regulated by the needle valve 8|.

Only one pole of the circuit breaker has been referred to in describingthe operation, however the blast tube I6 and the operating link 98 onshaft I0 may extend to the other poles of the breaker and operate thecontacts thereof at the same time.

Solenoid valves 34 and 35 are placed close to the main stop valve 29 sothat operation or partial operation cannot occur when valve 29 is shutbecause of air stored in the pipes between valves 34 or 35 and valve 29.

Although but one embodiment of the present invention has beenillustrated and described, it will be apparent to those skilled in theart that various changes and modications may be made therein Withoutdeparting from the spirit of the invention or from the scope of theappended claims.

This application is a continuation of an application of Gustav E.Jansson, Serial No. 527,047, filed March 18, 1944, now abandoned.

It is claimed and desired to secure by Letters Patent:

1. In combination, a member adapted to be moved in two directions, afluid pressure operated motor connected ywith said member for movingsaid member in one direction, a fluid pressure operated motor connectedwith said member for moving said member in the other direction, iluidpressure means for supplying uid under pressure to said motors, valvemeans including a cylinder and a valve body movable in a predetermineddirection in said cylinder for initiating the supply of fluid underpressure to one of said motors and for controlling the now of fluid fromsaid one of said motors to arrest movement of said member, andinterlocking means including a, piston actuated by fluid under pressuresupplied to the other of said motors, said piston being movable in saidcylinder toward said valve body to engage said valve body to preventmovement thereof in said predetermined direction.

2. In combination, a member adapted to be moved in two directions, 9,fluid pressure operated motor connected with said member for moving saidmember in one direction, a fluid pressure operated motor connected withsaid member for moving said member in the other direction, fluidpressure means for supplying fluid under pressure to said motors, acylinder having an opening therein, valve means including a check valvefor initiating the supply of fluid under pressure through said openingto one of said motors, said check valve being slidable within saidcylinder in a predetermined direction to uncover said opening, andinterlocking means including a piston slidable within said cylinder andbiased away from said check valve and actuated by fluid under pressuresupplied to the other of said motors, said piston being movable towardsaid check Valve from a nonengaging position therewith to an engagingposition therewith to prevent opening movement thereof in saidpredetermined direction.

3. In combination, a member adapted to be moved in two directions, afluid pressure operated motor connected with said member for moving saidmember in one direction, a fluid pressure operated motor connected withsaid member for moving said member in the other direction, fluidpressure means for supplying fluid under pressure to said motors, valvemeans including a cylinder and a valve body for initiating the supply offluid under pressure to one of said motors, said valve body beingmovable in said cylinder in a predetermined direction to open said valvemeans, and interlocking means actuated by fluid under pressure suppliedtc the other of said motors, said interlocking means being movable insaid cylinder toward said valve body from a nonengaging positiontherewith to an engaging position therewith to prevent opening movementthereof in said predetermined direction.

4. In combination, a member adapted to be moved in two directions, afluid pressure operated motor connected with said member for `movingsaid member in one direction, a fluid pressure operated motor connectedwith said memberfor moving said member in the other direction, fluidpressure `means for supplying fluid under pressure to said motors, acylinder having openings therein, valve means including a check valvefor initiating the supply of fluid under pressure through one of saidopenings to one of said motors and for controlling the flow of fluidfrom said one of said motors through another of said openings to arrestrelative movement of said member, said check valve being slidable withinsaid cylinder in a predetermined direction to uncover said one of saidopenings, interlocking means including a piston actuated by fluid underpressure supplied to the other of said motors and biased away from saidcheck valve, said piston being slidable in said cylinder and movabletoward said check valve to engage said check valve to prevent movementthereof in said predetermined direction.

5. In combination: an oscillatory operating link; a fluid pressureoperated motor connected Iwith said link for moving said link in onedirection, said motor being operable from an initial position to a finalposition; a, fluid pressure operated motor connected with said link formoving said link in the other direction; fluid pressure means forsupplying fluid under pressure to said motors, valve means movable inone direction in response to fluid pressure for releasing fluid pressurefrom one of said motors; and lost motion means connecting said link withsaid valve means whereby said valve means is movable independently ofsaid link in response to the supply of fluid under pressure to the otherof said motors to move said one of said motors from said final positiontoward said initial position.

6. In combination: an oscillatory operating link; a fluid pressureoperated motor connected with said link for moving said link in onedirection, said motor being operable from an initial position to a finalposition; a fluid pressure operated motor connected with said link formoving said link in the other direction; fluid pressure means forsupplying fluid under pressure to said motors, valve means movable inone direction in response to fluid pressure for releasing fluid pressurefrom one of said motors; lost motion means connecting said link withsaid valve means whereby said valve means is movable independently ofsaid link in response to the supply of fluid under pressure to the otherof said motors to move said one of said motors from said final positiontoward said initial position; and decelerating means associated withsaid one of said motors including said valve means to retard themovement of said other of said motors near said final position.

7. In combination, a member adapted to be moved in two directions, afirst fluid pressure operated motor connected with said member formoving said member in one direction, a second fluid pressure operatedmotor connected Iwith said member for moving said member in the otherdirection, a supply of fluid under pressure for said motors, means forutilizing said first motor for arresting movement of said second motor,said means comprising valve means for venting said first motor toatmosphere, first means actuated by said second motor for actuating saidvalve means, second means actuated by fluid under pressure for actuatingthe said valve means, and means acting independently of the movement ofsaid member for simultaneously supplying fluid under pressure to saidsecond motor and to said second valve actuating means to cause saidvalve means to operate independently of the movement of said member.

GUSTAV E. JANSSON.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 917,642 McElroy Apr. 6, 19091,283,179 Hennebohle Oct. 29, 1918 1,604,548 Dapron l Oct. 26, 19262,223,792 Muir 1 Dec. 3, 1940

